#1
Which of the following is a common type of control system used in HVACR?
PLC (Programmable Logic Controller)
MRI (Magnetic Resonance Imaging)
LCD (Liquid Crystal Display)
CPU (Central Processing Unit)
#2
What does VAV stand for in HVACR systems?
Variable Air Volume
Voltage Adjustment Valve
Ventilation Air Vent
Volume Amplitude Variable
#3
Which of the following is NOT a primary function of a commercial HVACR control system?
Monitoring energy consumption
Regulating indoor air quality
Controlling temperature and humidity
Operating kitchen appliances
#4
What is the purpose of an economizer in HVACR systems?
To increase energy efficiency by using outdoor air for cooling when appropriate
To control the flow rate of refrigerant
To filter and purify indoor air
To regulate the pressure within the system
#5
Which of the following is a common communication protocol used in HVACR control systems?
BMP (Bitmapped Protocol)
HTTP (Hypertext Transfer Protocol)
BACnet (Building Automation and Control Networks)
SMTP (Simple Mail Transfer Protocol)
#6
What is the purpose of a damper in an HVACR system?
To regulate the flow of air or refrigerant
To generate heat for the system
To filter out dust and contaminants
To monitor energy consumption
#7
Which component is primarily responsible for sensing temperature changes in an HVACR system?
Thermostat
Condenser
Evaporator
Compressor
#8
What is the purpose of a PID controller in HVACR systems?
To regulate temperature based on proportional, integral, and derivative control actions
To monitor power consumption
To control humidity levels
To adjust fan speed
#9
Which type of control system is typically used in large commercial buildings for HVACR?
DDC (Direct Digital Control)
AC (Alternating Current)
DC (Direct Current)
FDD (Fault Detection and Diagnostics)
#10
What is a key advantage of using wireless control systems in HVACR?
Reduced installation costs and flexibility in system expansion
Higher reliability and lower maintenance requirements
Faster response time and greater precision in temperature control
Improved compatibility with older building infrastructures
#11
Which of the following is NOT a component of a typical HVACR control panel?
Thermostat
Humidifier
Relay
Transformer
#12
What is the primary function of an evaporator coil in an HVACR system?
To absorb heat from indoor air
To compress refrigerant
To expel heat to the outside environment
To regulate airflow
#13
In HVACR systems, what does the acronym BMS stand for?
Building Management System
Basic Maintenance Schedule
Bypass Mixing System
Balanced Mechanical Setup
#14
What is the function of a pressure sensor in an HVACR system?
To measure and monitor the pressure of the refrigerant within the system
To regulate the flow rate of the coolant
To detect the presence of airborne contaminants
To control the speed of the blower motor
#15
Which of the following statements about HVACR controls is true?
Digital controls are less precise than analog controls.
Open-loop control systems do not rely on feedback to adjust performance.
Proportional control systems operate in discrete steps.
Feedback control systems are not suitable for HVACR applications.
#16
What is the purpose of a frequency drive in an HVACR system?
To control the speed of motors for energy efficiency
To regulate the flow of refrigerant
To filter and purify indoor air
To monitor temperature and humidity levels
#17
What is the purpose of a modulating valve in an HVACR system?
To control the flow rate of refrigerant
To regulate temperature settings
To amplify and switch electrical signals
To adjust the position of dampers